7.4 List of Periodic Replacement Parts
7-10
[ 1 ] Measuring the capacitance of DC link bus capacitor in comparison with initial value
at time of shipment
The measuring procedure given below measures the capacitance of DC link bus capacitor in comparison with
initial one at shipment when the power is turned OFF. The measuring result can be displayed on the keypad as a
ratio (%) to the initial capacitance.
------------------------------------------------ Capacitance measuring procedure ---------------------------------------------------
1) To ensure validity in the comparative measurement, put the condition of the inverter back to the state at factory
shipment.
• Remove the option card (if already in use) from the inverter.
• In case another inverter is connected via the DC link bus to the P(+) and N(-) terminals of the main circuit,
disconnect the wires. It is not required to disconnect the DC reactor (optional), if any.
• Disconnect power wires for the auxiliary input to the control circuit (R0, T0).
• Install the standard keypad (TP-E2).
* If the keypad has been replaced with the multi-function keypad (TP-A2SW) (option) after purchasing the
inverter, return it to the standard keypad.
• Turn OFF all the digital input signals fed to terminals [FWD], [REV], and [X1] to [X9] of the control circuit.
• If a potentiometer is connected to terminal [13], disconnect it.
• If an external apparatus is attached to terminal [PLC], disconnect it.
• Ensure that transistor outputs [Y1] to [Y4] and relay output terminals [Y5 A/C] and [30 A/B/C] do not turn
ON.
• Disable the RS-485 communications link and CANopen communications link.
If negative logic is specified for the transistor output and relay output signals, they are considered ON
when the inverter is not running. Specify positive logic for them.
• Keep the ambient temperature within 25 ±10°C (77 ±18 °F).
2) Turn ON the main circuit power.
3) Confirm that the cooling fan is rotating and the inverter is in stopped state. Disable the cooling fan ON/OFF
control (H06 = 0).
4) Shut down the main circuit power.
5) The inverter automatically starts the measurement of the capacitance of the DC link bus capacitor.
Ensure that “ . . . . . ” appears on the LED monitor.
If “ . . . . . ” does not appear on the LED monitor, the measurement has not started. Check the conditions
listed in 1).
6) After “ . . . . . ” has disappeared from the LED monitor, turn ON the main circuit power again.
7) Select Menu #5 “Maintenance Information” in Programming mode and check the reading (electrostatic
capacity ratio (%) of the DC link bus capacitor).
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